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Photostabilization of the herbicide norflurazon microencapsulated with ethylcellulose in the soil–water system
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Sopeña, Fatima, Villaverde, Jaime, Maqueda, Celia and Morillo, Esmeralda (2011) Photostabilization of the herbicide norflurazon microencapsulated with ethylcellulose in the soil–water system. Journal of Hazardous Materials, Vol. 195 . pp. 298-305. doi:10.1016/j.jhazmat.2011.08.039 ISSN 03043894.
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Official URL: http://dx.doi.org/10.1016/j.jhazmat.2011.08.039
Abstract
Ethylcellulose-microencapsulated formulations (ECFs) of norflurazon have been shown to reduce leaching, maintaining a threshold concentration in the topsoil than the commercial formulation (CF). Since photodegradation contributes to field dissipation of norflurazon, the objective of the present work was to study if such formulations can also protect from its photodescomposition. For this purpose, aqueous solutions of CF and ECFs, containing the most important soil components (goethite, humic and fulvic acids and montmorillonite) were tested. To get a more realistic approach, studies in soil were also performed. The results were well explained by a simple first order model. DT50 value was 3 h for CF under irradiation, which was considerably lower than those corresponding to the systems where ECF was used (35 h for ECF; 260 h for ECF–goethite; 53 h for ECF–humic acids; 33 h for ECF–montmorillonite; and 28 h for ECF–fulvic acids). ECF protected against photodegradation in both aqueous solution and soil due to the gradual release of the herbicide, which reduced the herbicide available to be photodegraded. These lab-scale findings proved that ECF could reduce the herbicide dosage, minimizing its photolysis, which would be especially advantageous during the first hours after foliar and soil application.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Life Sciences (2010- ) | ||||
Journal or Publication Title: | Journal of Hazardous Materials | ||||
Publisher: | Elsevier BV | ||||
ISSN: | 03043894 | ||||
Official Date: | November 2011 | ||||
Dates: |
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Volume: | Vol. 195 | ||||
Page Range: | pp. 298-305 | ||||
DOI: | 10.1016/j.jhazmat.2011.08.039 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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